This was a fun one, I’m a sucker for a good quest. It took me a minute to piece together that the characters were all in different places (well, Helen was easy), but I liked the unfolding mystery. Not much going on with River, but the time-spanning mystery of the doomsday clock and how the stories all wove together was good fun. I have no idea who this Clocksmith is, a third new Time Lord villain thrown into Doom Coalition? At any rate, the stakes are suitably high and the mystery of the clock is holding it together.